Hi, I'm new to the forum but lurked for a few years. I wanted to share my B12 success. My wife drives a 2019 Hyundai Tucson with the 2.4 Theta II. We bought it with 19 miles. At 2000 miles I dumped the 5w-20 and started running Pennzoil Platinum 5w30 and at some point started using Castrol Edge...